Dental parallelometer



E. SORENSEN.

DENTAL PARALLELOMETER.

APPLICATION FILED DEC. 20. 1918.

1,314,223. PatentedAug. 26, 1919.

5 fnvenlo t TIIL' caumnu ILANDGRAPII C0., WASHINGTON, D c. j

UNITED STATES PATENT OFFICE.

EMIL SORENSEN, OF NEW YORK, N. Y., ASSIG-NOR TO CERTUS PARALLELOMETER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW'YORK.

DENTAL PARALLELOMETER.

Specification of Letters Patent.

Patented Aug. 26, 1919.

To all whom it may concern:

Be it known that I, EMIL S6RENsEN, a cit1- zen of Denmark, and a resident of New York city, in the county of Bronx and State of New York, have invented certain new and useful Improvements in Dental Parallelometers, of which the following is a specification.

This invention relates to an apparatus of novel construction designed more partlcularly for accurately fittlng a dental bridge to a pair of spacedteeth. Dental bridges as now frequently constructed, are secured to the teeth in a removable manner, so that they may be taken out whenever desired for the purpose of cleaning or sterilizing the bridge, or gum. In order to effect this removable connection, the bridges are provided generally with a pair of prongs, that engage a pair of sockets sunk into the foldor other inlays with which the prepared cavities of the teeth are charged. In order to obtain an accurate fit and thus permit a ready removal and insertion of the brldgc, it is necessary that these sockets be secured in perfect parallelism with each other, which with the means now at hand, has been found to be a matter of considerable difficulty. By the apparatus which forms the subject matter of this invention, this parallel fitting of the sockets can be performed in a simple, quick and accurate manner.

In the accompanying drawing,

Figure 1 is a vertical section of a parallelometer embodying the inventlon;

Fig. 2, a rear view;

Fig. 3, a plan;

Fig. 4, a horizontal section on line 1'it Fig. 1;

Fig. 5 a longitudinal section of one of the work holders, and

Fig. 6, a perspective view of an example of one of the sockets.

The apparatus comprises a horizontal base plate 1, mounted preferably upon rubber feet or buttons 2. From plate 1, rise a pair of posts 3, having opposed grooves or ways 1, and constituting the support for a vertlcally movable table 5. This table (which is preferably arc-shaped, to resemble generally, the outline of a Jaw), extends hor1- zontally from an upright back or guide 6,

received by grooves 4, a bracket 7, serving to effect a firm connection between the table and its back. To rear side of back 6, is afiixed, an upright back 8, engaged by a pin- 1011 9, fast on a shaft 10, which turns in bearings 11 of posts 3, and is provided with a knurled head 12. It will be seen that by turning shaft 10, table 5 may be raised or lowered along posts 3, so as to approach or recede from base plate 1. In order to limit the downward movement of the table, there is provided, an upright stop pin 13, passing ad justably through a sleeve 14, secured to back 6, and engaged by a clamp screw 15. This pin upon striking plate 1, will prevent the further descent of table 5, so that by raising or lowering the pin within its sleeve, the downward path of the table may be correspondingly increased or dimin ished. To the forward arcuate edge of table 5 are adjustably secured, a plurality of holders for engagement with the sockets that are to be fitted into the teeth. Each holder is shown to consist of an upright pin or spindle 1(3, engaged by a chuck 17, which is rigidly secured in a vertical position to the outer end of a horizontally disposed elongated plate or member 18. This member is provided with a longitudinal slot 19 engaged by a clamp screw 20 tapped into one of a. number of perforations 21, that extend along the curved edge of table 5. Members 18 overhang the edge of the table, so that in this way, the chucks clear such edge, and so sustain their spindles 16 that the latter will project beyond and below the table in a true vertical direction, or in parallelism with each other. By slacking screws 20, the holders may be slid further inward or outward in a longitudinal or approximately radial direction and they may likewise be oscillated laterally into greater or less proximity to each other, so that any two spindles may be adjusted into any desired cooperative relation the spindles, however, maintaining their parallelism during all adjustments.

To the lower end of each spindle 16, is adapted to be removably held one of the sockets or female members to be fitted into the teeth. \Vith the embodiment illustrated, the lower end of each spindle is T shaped in cross section to fit into a slotted socket 22 of the shape illustrated in Fig. 6. But the shape of the socket may be varied at pleasure, which would necessitate a corresponding change in the shape of the spindle. I

Upon bed plate 1, is adapted to be mountedbelow table 5, a platen or support 23 upon which a cast or dental model 2 L may be secured in a horizontal position. The platen is removably held to bed plate 1 by dowel pins 25 entering corresponding openings of the latter. Along the periphery of platen 23 is formed a row of apertures 26-, adapted for the reception of a plaster Paris or similar'binder by means of which theinod'elmay be afiiXed to the platen.

7 respective part of the jaw is made.

The apparatus constructed as described may be used in a variety of ways, depending on "the particular work'to be perfori'ned and upon the option of the dentist. The following will serve as an example: 7

The teeth that are to serve as a bridge anchorage, are prepared in the'mo'uth of'the patient, and" a cast of the whole or the p This cast or replica is secured to platen 23' by means of an intervening layer of plaster Paris 27 which by par-tlyenteri'ng apertures 26, efiects a firm anchorage.

Table 5 is raised, a pair of sockets 22 is fitted upon a pair of spindles 1'6, and the spindle holders are so adjusted that the sockets are suspended directly above the teeth cavities within which they are to be seated. Table 5 islowe'red to project the sockets into such cavities, and a wax' filling 28 is molded around the sockets, to 'fil-l out the cavities, and reproduce the contour of the teeth. The table is raised,jthe parts are separated a'ndth'e wax casting is reproduced in gold inlay, afterwh'ich such inlay may be fitted into the teeth of "the model and the socketsmay be refitted, by the apparatus into the inlays to check up the work. Both the inlay as well as the sockets are now adapted to be fitted accurately into the mouth'o'f the patient.

It frequently happens that a bridge is to be anchored to more than two teeth, and it is for this operation, that a greaternumber thlan two spindle'sshould 'becarried by the ta le.

Aftera fit hasbeen made on one model, it may be removed together "with its platen 23, and a new model, together with a new platen be introduced, so that any number of models may be successively worked without necessitating the finishing up of one model before the installation of the 'neXt.

It will be seen that by the apparatus constructed as described, the sockets may be fitted to "the teeth in a quick, simple and accurate'manner, thus assuring a correct fit ofthe bridge.

Various changes may be made in the details of the construction of my parallelometer, and mechanical equivalents may be substituted for one or more of the elements of my claims without departing from the spirit of the invention as outlined in such table, a plurality of horizontally disposed plates mounted on such table to overhang the edge 'ofsuch'table, means on such table for securing said plates to such table in a manner to permit a linear and arcu-ate adjustment of such plates on such table and bridge-socket holders carried by said plates.

'3. A parallel'ometer comprising a support for a dental model, a vertically movable table, a plurality of members overhanging said table, means for adj'ustably securing said m'ernbers'to said table, and a plurality of bridge-socket holders carried by said members.

4:. A parallelometer comprising a support for a dental model, a Vertically movable table having apertures, a plurality of members overhanging said table, said members having-slots,- bolts that engage said apertures and slots, chucks carried by the members, and spindles carried by'the chucks.

A p'arallelom'eter comprising a support fora dental model, table, means for vertically moving said table, a plurality of bridge-socket holders adjustab ly secured to the table, and an'adjustablestop controlling" the movement of the table toward said support. A

6. A parallelometer comprising a base plate, a platen adapted to support a dental model, cooperating devices on'th'e base plate and platen whereby the platen is secured to the base plate in a predetermined position, a vertically movable table, and a plurality of adjustable bridge-socket'holders carried by said table.

v 7. A parallelometer comprising a base plate, a platen having apertures adapted to anchor a dental model, cooperating devices on the base plate and platen whereby the platen is secured to the base plate in a predetermined position, a vertically movable table located above the platen, and a plurality of bridge'socket holders carried by said table.

8. A 'parallelometer comprising a pair of grooved uprights, a table, a guide on said ing said platen to said plate, means for table engaging said uprights, means for removably securing a dental model to the setting said table along said uprights, and a platen, a vertically movable table above the 10 plurality of adjustable bridge-socket holders platen, and a plurality of bridge-socket 5 carried by the table. holders adjustably secured to the table.

9. A parallelometer comprising a base plate, a platen, means for removably seeur- EMIL SORENSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

